When Frank opens the back door of the U-Haul, after Charlie and Dennis light the chairs on fire, he opens the door with no resistance, even after Dennis held the door open with duct tape.
When everyone drives off with Dee's car pulling the trailer, Dennis's Range Rover is parked in front of the bar, yet the next morning when they return it's no longer there.
When Dee first arrives in her new car in the opening scene, a trailer hitch ball is installed. A few minutes later when the gang returns to the bar and the camera pans to Dee's car, the hitch is missing.
In the opening scene in front of Paddy's, Mac is seen wearing a red t-shirt. In the car scenes following, the t-shirt has now changed to black.
In the opening shot, the shadow on the U-Haul trailer changes position many times.
The gang constantly refers to "bargaining" as "bartering". Barter is the use of goods and services to 'pay' for things without the use of cash. They are actually talking the price down and still using cash to make the exchange, therefore bargaining, dickering, or haggling with the business owners.
When Mac and Charlie are visiting the "Italian Market", Mac purchases a pear for Charlie, as he had never had one before. As Charlie consumes it he decides he doesn't like the way it tastes. This upsets Mac and he demands the thirty-five cents he paid for the pear back from the store owner. Upon turning back around Charlie claims he has eaten the entire pear, despite the fact he does not like it, but if you watch the pear closely throughout this scene not only do more (large) bites appear to be taken from the pear from shot to shot, the pear is in a different hand, and you can see Charlie lower the pear off screen and drop it. His hand then quickly returns back to frame in the next shot.
When Mac is at the market and paying the fruit stand owner, he drops a coin.